渤海湾秦皇岛段潮间带表层沉积物重金属污染分析

Analysis of Heavy Metal Pollution in Surface Sediment in Intertidal Zone of Qinhuangdao Coastal Area of Bohai Bay

基于对秦皇岛段潮间带表层沉积物的调查研究,分析了表层沉积物中Cu,Pb,Zn,Cd的污染特征,并采用潜在生态风险指数法对其评价.结果表明,表层沉积物中Cu,Pb,Zn的平均质量分数符合国家土壤环境质量的一级标准,Cd平均质量分数超过国家土壤环境质量二级标准的4.6倍.4种金属的潜在生态风险顺序是Cd>Pb,Cu>Zn.各样点Cu,Pb,Zn均属于轻微生态风险程度;而Cd具有很强-极强的潜在生态风险程度,可能会影响近岸水体和海洋生物的质量.

Based on the investigation on the surface sediment in the intertidal zone of Qinhuangdao coastal area,the pollution characteristics of Cu,Pb,Zn and Cd in the surface sediment were analyzed with their distributions evaluated with the Hakanson＇s potential ecological risk index.The results showed that the average mass fractions of Cu,Pb and Zn come up to the grade-Ⅰ of the national environmental quality standard for soil,while the average mass fraction of Cd exceeds 4.6 times as high as the grade-Ⅱ of the standard.The potential ecological risks of the four kinds of heavy metals are different in comparison,i.e.,Cd〉 Pb,Cu〉Zn.On the whole,the ecological risks of Cu,Pb and Zn in surface sediment are all slight,whereas that of Cd is strong even very strong,which may hazard the littoral water quality and halobios.